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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c97e53d93a7cbce6676b5c5b54bc4f19e6b9618f1c68dcc29e191d5315966cd' 
  AND token = '4FCteYrmzR2J531M/mHtiJTXSQK4JIi/vltSLd1aIGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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