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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8ba7e51de13b079dc589f1c2c1e2d0a862891fa7d4e9082d2215848942c1af' 
  AND token = '6f2Aoly5MWhAzM+l6qKL0YybTP1B6fMP/aILqiKGLQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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