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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600bcdb6040e5d58978230307f1f118b8bbbe6b1ed3ae0f298ac0cee84bb5927' 
  AND token = 'lKE7Rn9jJQh4JsdNcYu1y1qWE049W+zsM/lYCMxRAaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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