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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd657699fcbf0861b4498ffe4905c7ea8de4732c438f0e410234518c218e7f9b2' 
  AND token = 'MJln3v0F0kMw+H+AXnJKpBa/aEy+Toa0++31zmuSf90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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