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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2507d00bef8483c38b8654253aab1e80d50565e1f15abf8025d66bd61885b1' 
  AND token = '/tntFjvv1/TCxrE8ABti8OK+D7gx6j5Eh6xcYyeGPEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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