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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7be0d93c6c3bc405847eb0f45ea1694dc45a66e528761f5016031d60e65b9b2' 
  AND token = 'gEovEzFaFIEqdYJXv4fLVH1U6kAFGQ8bowPnVCHiYOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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