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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c6fb4ec0bec14185ef74005403566702781f7843ae450acabca90bf5a4272a' 
  AND token = '3h05MmRFwJosPQMRGQwnCZW2Ys1+EoIf48M8rWRg6Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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