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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b1e871e5d687bb2d695b0dec64ddaa94a072ed367ee59bcec3997dc36fb4c5' 
  AND token = '83G39nlgg8ibtDbk9G9i2yGjB5X3s22gvW6ujvOUuhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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