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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c6faf1c071461fc348b1ea84bda8691ba9f04bfa597a86ff45bf067748dae2' 
  AND token = 'S7yC8y65HnJ3TszVRRsp81F8NpaD3RsnZLMJpb1SEh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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