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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fe497b6b8f29e572014ccc3b39b3368b1ef1586e579d3f7905ec461d6dd0f7' 
  AND token = '7pkKImkmSixzwa2l/3aDay0n+lasOFebbkb0EjdktzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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