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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dac0d138381b6ea2a76b2db905cdfa6813e17485142ac9dbd39cbf25d364d74' 
  AND token = '8+42WD82tizhH0eGqGv7BHxhYAIsv4rt3b9T23oqCQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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