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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19be7cfb693bab7e1491c6968c87892466bb51bea8070a4e2deec76702a12054' 
  AND token = '0nCP2GXS71E9Fg8/XzK18n++K+e5be53Z/V2oFcwscQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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