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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170996c68bc24d4ee16ba34a8bf5c373a23d0bfb9b19800d738f1ccad8bf16e1' 
  AND token = '0ZcY4bcufQ+ePPrtrmkAjaZmWPMdwgX+0imSzjSB2ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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