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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271de247260563da44dba746e153d5f3ef1db5100469583e82924dc23c45e827' 
  AND token = 'kn0zxkocGTo4D2c5MAANhdX05c3+mnToRXtEYI/qKrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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