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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6959c5d482c3cd17d74727923e657e1794db55b0789a96877def178f674b2e' 
  AND token = 'ivfNIm3Oowz0ntNpfUP5Ng8vhVK8bqoE/im8w9ZnmIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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