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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2ccfa766730dc8966a316965e278b2234121c84abbfef6d7c126d02ec57a12' 
  AND token = 'Byn7Spb3aN4OVQR7zDGyhfHbWbvZCz9ybz5UbbJCyIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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