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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a3e20591ac0e2edff2ea53c3b018a06214b9342ff5f8beb88d30b93dabe3cf' 
  AND token = 'UV8VGPTOQQKo9W3sCQxyDbaLRQAcKqcjLkhpi5uqiwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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