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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b67da158507e2199474ca337365acf52927d1a51a0fe55eb8551252b6160ed' 
  AND token = 'tGRC8QSUeE00xThG3khz9Tvip2RbFiGuhk7j4Ho7n0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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