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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582a7d324705b6754702b7bc2b18155a80ae8d6b6f71fd4b1d85c88d43b9231b' 
  AND token = 'dGTrudDP0rgeMOXq0mHITCDzqdndPPCoNza6eD0IOa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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