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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b186c4b53f94c5d76f3831a33dfa858756821d058030ba615acc8bb18b3f6cc8' 
  AND token = 'DCKKRkPSnlm2lEYNLgh3Os01qvPcI26xAaGiLo1UdNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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