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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2b52fec85d725fe293a35d336fbc318f1a9c521472a40104ece81acacb86b9' 
  AND token = 'i6nixqnjYLuLct/YhY4U3Wi6ctCGEG585FG2uOgwQf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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