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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40838862b6802b9127d93512c0d2ab5b894b3cd8c4fd1477f9d937b38e55c63' 
  AND token = 'p1fHvs94w7t5As9uzg2cYIFh0ttadTVUAsiSiMcnzkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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