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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563902e25e290a7dc7bc858e49ce37b96971292d5ef014acfa120e163ab91a4a' 
  AND token = 'EpuXkLr0yrsOpH6n55Ekb6AhQ7eBJTguii9Ig3VwFa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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