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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf23a82e2aa443672fd3fb1358167edcb9cb976ccfa709d94f04a1a1de362d2d' 
  AND token = 'cihfKcOIXAhupkgj6Y/xb0prryK5pY2zEup9unhDbcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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