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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0beb81476923c2d11a0f0f96d1fb6e50ca49e37d1f6dff282c3a4ffa9e7e29' 
  AND token = 'n2I/K0WqWny2n/LdH5/U8cSTpxNsnUAUQWEeGUEFGDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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