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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23be7acd8463e0c948f89ccc0a35a5193802513043f8e20faca9e96c24b9476e' 
  AND token = 'lCk0uoRR/wBFpuIlOaIPRj/QENVLTdSVpfj1phw+EE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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