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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba6039c57de3926fa7badff1926baeada457f95ebd7d25424956363c3f4ffdc' 
  AND token = 'j5EkiNVmvfxibVWPiZb7a8q3VkxmSp6JCroJa1BHgj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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