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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677cb157f4946d8f591ffb1aabb32bdf5254b6a0f1b4e47ddd464bfd4fb2e1bc' 
  AND token = '2kSksbz4cdcfgd8pAy5q+uHIj9n1RgDGrtdLzEYgf7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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