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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd06c65bbf9d6f640890b81c9255fe51142930357116dadebb3627dcf4234bd' 
  AND token = 'HP0mH8zlLJ4U1+250x2Vz5OFgiMfi+Od2hXZvoDguW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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