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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b4e07235d53ad861c1d591f0778dcede84ea2c8b14f7b5bc1ae406827149b3' 
  AND token = 's2r87lG5rVNukDaTRosQf5vY2u7xstk3CCYCpJGVx9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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