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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca61a91fa4db03c1f77701a8c18b58fd4303ea17e535b8f7e184ec799f3a467' 
  AND token = 'QduDelc++0mzIZsrh8nHFjLFn8gD++0VkimDaHjQf3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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