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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062af162070861165fa070f08c9847701e2f088084c6d8b8fc8ccfa860ac8ed9' 
  AND token = 'K1dR3vV/eq+M9JGm0LqWR48ryN0e7dF8rK8nryUwgxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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