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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b94d99223fd6bcec7d31c8a06799b630abb672aaf48a101f41b6f548353d3cf' 
  AND token = 'Y/3CqduSsaKHIBDE+KMCrH8EavMwRll2l1z16NsSkOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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