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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf4803a008cbb2b9a570ca23c8cd88e862e8a31b18af599cb63bd1e5f5df825' 
  AND token = 'ClCHxtBFLb+FGTYm5XckeSW9VrKyjZ9yadM7MN+zfXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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