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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49868c203e4740397fb157f93e7d0a99d02304f0605c64a787b0c185cfc92504' 
  AND token = 'D4OsTaFeZAScx7HlDMzNMCgqQQijXfhPkfTwwGKUO5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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