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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689b725cc3d4a4d178cbac3f4368ac7ac3dfdaa4fa24b9aaceb7a92db6e0f083' 
  AND token = '+XAfJ3AlvIe/hsFETHPiEzMUHwEyfidqAZfFPk5SpmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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