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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3314d03c0a63a27a4ea1948548159c0364f3d1b4f809eded7ae50d4a1321438d' 
  AND token = '85BlA1EKdjfCPSdb8uLvfchRfXn2s6AVqUJyXDgbMMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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