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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef39de6aee48881c0d0d665bfd3cff811b2523f0814b02f3e1c3546ff6227f0' 
  AND token = 'Oa4a+SCTPPV1ala0gxTERvDHdSMjC2sgrWwPzYu/uxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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