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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c4c98d859a628e10b42b780ae4d35210e13f513ac03558b969b6ed9c72c0c9' 
  AND token = 'nWEJAAyLb1kW5kUqks4LwF/5wJHkZu1Aknar2EMJtXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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