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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55dbec0e3ba022fb3c2a3992a5d827fb35029092abcd083bd193586b793b7012' 
  AND token = 'K6TvY4rPgIlHfrBfbRyj6qKjVIjUaJlNpFAU4ilYcKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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