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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f698eafe16ff0ea51e7e9b5e51f648f739a356fa4d977f5329eb77f9a062e827' 
  AND token = '7ZWj3AUYAWnH4lLWSCiG5+pU6sIZ7HAny2l25yamAqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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