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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712596ddf5b1df3e262bc7aea45a9662da9354cb7557e08265320419af3f997a' 
  AND token = 'R9Qd+S7c4xuJTzHbexl3REQCfAcyOtd+rkgWO9ewdrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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