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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56039f904b4e113113ade51db5c842b6f0fadc1843208890d28c8a1dd5310d4b' 
  AND token = 'tD7DZX5pGEeNPy09uy1rnE+SPP/kWEzrLHcXqPa6DKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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