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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e360ce3ed59573d9dfe24d8d0da13cb0899d8d4a572ae7fa4b1e18ffcfbdab3d' 
  AND token = 'BO+PfDhJS5BUSq4ZLPATYxnugsSNtLc9dvVGCEno6cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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