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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9db9154e71429800b24405a451911d521247b9a8a347c6bd1d744a8f004111d' 
  AND token = 'MY8mN7pXq3bvI1bpnSg0vVuUQ8GOCMO8dc94vfyDeww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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