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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7e1d30b77ea03ec56edc64bcb6a245023fd26fa4f50fd1f1d3a203ccb2fd5b' 
  AND token = 'naf4LQYOIIPJvLqEHCicxllhKhaaizbLDMXDSzmxcDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}