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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91003ff1f18a206bffcad8ba4f45e9c9e884b777a72c5d5b27f6313fee46454a' 
  AND token = 's9LT8Vy+uOpjhkVfXEFq24OptwRNWkSbty77d2BX7xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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