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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aefbaa745e0cf6b91ff96b2e7e8da3a7024f5bb13b8caac6520cb707b86ebc4' 
  AND token = '3n2jCa1ydY6VXI/vUnwiZxfnAC75VSkx5PGD6khFQQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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