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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2810f13c5f9c84ba6b152f64b9a56b6b6244d1bd2823fbdaddd87cccd31f7b82' 
  AND token = '9iuwaSARMG4YRhxtzqgZjSt6lqHpC0eX8EHHTEDC1mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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