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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f839b4734030896789b59ea0328752f653292cf5c82e17e150cdcddd8177ed12' 
  AND token = 'Tzv/Jr8qJ3z0cu6jd1HXUQxqy1BQHS/E2PiiB5ymJgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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