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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d139b654193f72b6111c5374744beb6dea6b8dc8c8a86f1b5bfc91e062451a' 
  AND token = 'qE4thhKV/IlS0yUXcII77sqQwprNps2sHNlsLJ2IQgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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