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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09a12c897dadd8d6955d89f4038202feec2897997bc73eab79ead6c2a34672f' 
  AND token = 'fey3x1ky4buA6UAZO0XU2XHhUeH+4TQRRp/QUClCFPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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