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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ca54eee2fa4388b76be6c3acd60c5b46fde73c67e2d3f44355f94b47cdf61b' 
  AND token = 'ra0UuTklJjI5WzsziNdEkwWVAjCL5br2jsftczBpQL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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