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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405c254b045c2e9e6b99d512956c3bb418277ef518c8437f26e3e716b28d831e' 
  AND token = '0tMrcvnmW3uhYJeVDezqq9ZadvxNAYaAs7VWQ4U3OJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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