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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2992c0670e5e46001b8ab884e61a9fd10d3d934e0d79ada641ab28751e5f8a5c' 
  AND token = 'yufzz/18r5HIfgBHpkCWreoDS/Ify8ZLEbHo9PXR424=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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