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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7697757d587c18a3f4972a749dcbcc4758b4e165655ab1db56fa3b93519abb7e' 
  AND token = 'dl+UP5i52CukWFM6GDXQl8hL2CV5UpCJgAVfHSC+l78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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