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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27bf4cc3b6c51550b5053258c46b7f26a640409f5b68128729c23c4327ed39f5' 
  AND token = 'Wn+wXGLrxg33QB1rV3xAO0wTF+p750Cyk7i2AkNVZuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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