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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09cae8f19823f1c74196df01f2dfc84447e891fd0872a1bb34309631b946766d' 
  AND token = 'xZpeWEYa7sEADHR6X7PGPR7oK42KuGNcq/Rwu8hJjbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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