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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba97f46dce212ddc55a02ede9dc750f60205a9fce791dc0a8769b6c774c58cf9' 
  AND token = '7KWLBMD6o1bvaKvj16IQVnQwCIkkzDThxiWXXuVWlx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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