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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a9ffedc3d7e16df19f2f9f38c13e6620e7a5abbaa3d501dd6caddc7f50b7e3' 
  AND token = 'klF7eBO1Xr7JQXqcAtBn3BOpDPc5Tl8J7ETRmPTXVU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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