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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a4fca3815d01d4a22c5015ca5afd6d00b4ffc9fd519667f7b534d1e9c9569b' 
  AND token = 'ZS6R6aFQOD37RMFbfsmp/F4OlzLJ82xa9jz1HNdYAwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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